Where does the gastric juice in the stomach came from?

Gastric juice in the stomach is produced by the gastric glands located in the lining of the stomach. These glands secrete various components, including hydrochloric acid, pepsinogen, and mucus. The acid helps break down food and kill pathogens, while pepsinogen is activated to pepsin, an enzyme that aids in protein digestion. The combination of these substances creates an acidic environment essential for digestion.